The best price for just about anything is Discount Cycle Parts. Outstanding Customer service, have been using them for years.

http://www.discountcycleparts.com/

 

Freedom wings for me. They have the largest volumne of air flow because the entire wing adjusts. Combined with a Sliver Eagle Outfitters cooling vest and you can be downright cool on a hot day. Except for your brain. Still haven't found a good air flowing helmet that DOES protect your head.